<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>test</title>
</head>
<body>
    @var a=11;
    @var b=2;
    @var c=a+b;
    @var d = 10;
    <h1>${c+1}</h1>
    <h1>${d}</h1>
    <h1>hello beetl</h1>
</body>
</html>